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SubjectRe: ACPI locks hardware devices when it doesn't detect vista
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On Sat, 2009-08-22 at 23:41 +0200, Rafael J. Wysocki wrote:
> On Saturday 22 August 2009, Maxim Levitsky wrote:
> > Hi,
> >
> > <joke>
> > This should be brought to a Microsoft antitrust case...
> > </joke>
> >
> >
> > Today many notebooks ship with a embedded infrared receiver.
> > In Vista there is new subsystem that decodes these signals.
> > (of course it works only with Microsoft Certificated Remotes (TM)...)
> >
> > The receiver is usually presented to system as a pnp device
> > (using acpi tables)
> >
> > It turns out that some bioses actually use the OSI, ACPI feature of the
> > operation system to detect if running inside Vista. If not they disable
> > the infrared receiver.

Just one note. At least I am now sure that OSI("Windows 2006") does
return true by default.

I have tried booting here with acpi_osi="!Windows 2006", and actually
the CIR PNP device disappeared. I guess that _STA that returns zero
causes that.

On his laptop, ENE0100 device doesn't disappear, but still someone
writes zero to LPCB.IOR2 (we checked and found out that it was zero)

Maybe its zero by default, but some 'magic' driver in windows sets it
up, but this is a PCI config register on LPC bridge, (0x88) and I am
almost sure that nobody except bios knows about it.

Windows IR driver doesn't touch it for sure.

So, it could be that _STA is once called before the _SB._INI ?


Best regards,
Maxim Levitsky

>
> Oh well.
>
> That should've been Cced to linux-acpi (now added). I'm looking forward to
> seeng a comment from Len.
Sorry....

> > On my system this it is still tolerable:
> >
> > Device (MIR)
> > {
> > Name (_HID, EisaId ("ENE0100"))
> > Method (_STA, 0, NotSerialized)
> > {
> > If (LGreaterEqual (OSYS, 0x07D6))
> > {
> > If (LOr (And (OTHR, 0x02), And (OTHR, 0x40)))
> > {
> > Return (0x00)
> > }
> > Else
> > {
> > Return (0x0F)
> > }
> > }
> > Else
> > {
> > Return (0x00)
> > }
> > }
> >
> > But not so, on Mairo's system:
> >
> > Device (MIR)
> > {
> > Name (_HID, EisaId ("ENE0100"))
> > Method (_STA, 0, NotSerialized)
> > {
> > If (LAnd (MCIR, LEqual (OSYS, 0x07D6)))
> > {
> > Return (0x0F)
> > }
> > Else
> > {
> > Store (Zero, ^^LPCB.IOR2)
> > Return (Zero)
> > }
> > }
> >
> > .......
> >
> > Method (_WAK, 1, NotSerialized)
> > {
> > .......
> > If (Not (LAnd (MCIR, LEqual (OSYS, 0x07D6))))
> > {
> > Store (Zero, \_SB.PCI0.LPCB.IOR2)
> > }
> >
> >
> > .....
> >
> > Scope (_SB)
> > {
> > Method (_INI, 0, NotSerialized)
> > {
> > If (DTSE)
> > {
> > TRAP (0x47)
> > }
> >
> > Store (0x07D0, OSYS)
> > If (CondRefOf (_OSI, Local0))
> > {
> > If (_OSI ("Linux"))
> > {
> > Store (One, LINX)
> > Store (Zero, ECDY)
> > }
> >
> > If (_OSI ("Windows 2001"))
> > {
> > Store (0x07D1, OSYS)
> > }
> >
> > If (_OSI ("Windows 2001 SP1"))
> > {
> > Store (0x07D1, OSYS)
> > }
> >
> > If (_OSI ("Windows 2001 SP2"))
> > {
> > Store (0x07D2, OSYS)
> > }
> >
> > If (_OSI ("Windows 2006"))
> > {
> > Store (0x07D6, OSYS)
> > }
> >
> > If (LEqual (TPMV, One))
> > {
> > If (LLessEqual (OSYS, 0x07D2))
> > {
> > TRAP (0x49)
> > }
> > }
> > }
> >
> > If (LAnd (MPEN, LEqual (OSYS, 0x07D1)))
> > {
> > TRAP (0x3D)
> > }
> >
> > TRAP (0x2B)
> > }
> > }
> >
> > We have tried to boot the system with acpi_osi="Windows 2006", but it
> > didn't help (kernel log confirmed that this parameter was set)
> >
> > The only explanation I think of is ether his laptop is whitelisted on
> > osi=Linux, or that _SB._INI is called by linux _after_ MIR._STA
> > or that acpi_osi isn't yet in charge when _SB._INI is called.
> >
> >
> > The kernel in question is quite recent kernel, (2.6.30.5 from debian
> > unstable).
> >
> >
> > The only way I managed to 'enable' this device is to
> > do 'sudo setpci -s 00:1f.0 0x88.W=0x701'
> >
> > Or in other words undo the damage done by these ACPI commands.
> >
> > Mairo, can you boot the system with acpi=off, and then poke the cir IO
> > range (0x700-0x703) ?
>
> Best,
> Rafael
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